Jens Axboe writes:
> On 6/18/18 1:33 AM, Michael Ellerman wrote:
>> Tejun Heo writes:
>> ...
>>> Jens Axboe (10):
>>> libata: introduce notion of separate hardware tags
>>> libata: convert core and drivers to ->hw_tag usage
>>> libata: bump ->qc_active to a 64-bit type
>>>
The size is always equal to 1 page so let's use this. Later on this will
be used for other checks which use page shifts to check the granularity
of access.
This should cause no behavioral change.
Signed-off-by: Alexey Kardashevskiy
---
drivers/vfio/vfio_iommu_spapr_tce.c | 8
1 file ch
This is to improve page boundaries checking and should probably
be cc:stable. I came accross this while debugging nvlink2 passthrough
but the lack of checking might be exploited by the existing userspace.
Please comment. Thanks.
Alexey Kardashevskiy (2):
vfio/spapr: Use IOMMU pageshift rat
We already have a check in drivers/vfio/vfio_iommu_spapr_tce.c that
an IOMMU page is contained in the physical page so the PCI hardware won't
get access to unassigned host memory.
However we do not have this check in KVM fastpath (H_PUT_TCE accelerated
code) so the user space can pin memory backed
On Mon, Jun 18, 2018 at 10:04 PM, Andreas Schwab wrote:
> On Jun 18 2018, Mathieu Malaterre wrote:
>
>> Sadly, trying again today does not work anymore. Adding some printk
>> just before WARN_ON:
>>
>> +printk(KERN_ERR " rtc DBG pmu_get_time1: %lld %d %lld \n", now,
>> RTC_OFFSET, now - RTC_OFFSE
"Aneesh Kumar K.V" writes:
> With 4k page size for hugetlb we allocate hugepage directories from its on
> slab
> cache. With patch 0c4d26802 ("powerpc/book3s64/mm: Simplify the rcu callback
> for page table free")
> we missed to free these allocated hugepd tables.
>
> Update pgtable_free to han
Christophe LEROY writes:
> See http://kisskb.ellerman.id.au/kisskb/buildresult/13395345/ for details
>
> Seems like that function only exists when CONFIG_NMI_IPI is defined.
>
> Problem introduced by commit 5cc05910f26e6fd6da15f052f86f6150e4b91664
> https://git.kernel.org/pub/scm/linux/kernel/gi
Ram Pai writes:
> In a multithreaded application, a key allocated by one thread must
> be activate and usable on all threads.
>
> Currently this is not the case, because the UAMOR bits for all keys are
> disabled by default. When a new key is allocated in one thread, though
> the corresponding UA
Ram Pai writes:
> When a thread forks the contents of AMR, IAMR, UAMOR registers in the
> newly forked thread are not inherited.
>
> Save the registers before forking, for content of those
> registers to be automatically copied into the new thread.
>
> CC: Michael Ellerman
> CC: Florian Weimer
Ram Pai writes:
> Deny all permissions on all keys, with some exceptions. pkey-0 must
> allow all permissions, or else everything comes to a screaching halt.
> Execute-only key must allow execute permission.
Another ABI change.
Are we calling this a bug fix?
cheers
Florian Weimer writes:
> On 06/14/2018 02:28 AM, Ram Pai wrote:
>> Assortment of fixes to pkey.
>>
>> Patch 1 makes pkey consumable in multithreaded applications.
>>
>> Patch 2 fixes fork behavior to inherit the key attributes.
>>
>> Patch 3 A off-by-one bug made one key unusable. Fixes it.
Ram Pai writes:
> Applications need the ability to associate an address-range with some
> key and latter revert to its initial default key. Pkey-0 comes close to
> providing this function but falls short, because the current
> implementation disallows applications to explicitly associate pkey-0 to
Ram Pai writes:
> execute-only key is allocated dynamically. This is a problem. When a
> thread implicitly creates a execute-only key, and resets UAMOR for that
> key, the UAMOR value does not percolate to all the other threads. Any
> other thread may ignorantly change the permissions on the ke
Ram Pai writes:
> Total number of pkeys calculation is off by 1. Fix it.
Oops.
Fixes: 4fb158f65ac5 ("powerpc: track allocation status of all pkeys")
Cc: sta...@vger.kernel.org # v4.16+
cheers
Souptick Joarder writes:
> On Thu, Jun 14, 2018 at 9:36 PM, Frederic Barrat
> wrote:
>> Le 11/06/2018 à 22:29, Souptick Joarder a écrit :
>>>
>>> Use new return type vm_fault_t for fault handler. For
>>> now, this is just documenting that the function returns
>>> a VM_FAULT value rather than an
Paul Burton writes:
> With SYSCALL_DEFINEx() disabling -Wattribute-alias generically, there's
> no need to duplicate that for PowerPC's pciconfig_iobase syscall.
>
> This reverts commit 415520373975 ("powerpc: fix build failure by
> disabling attribute-alias warning in pci_32").
>
> Signed-off-by:
On 06/19/2018 02:39 PM, Michael Ellerman wrote:
Ram Pai writes:
Deny all permissions on all keys, with some exceptions. pkey-0 must
allow all permissions, or else everything comes to a screaching halt.
Execute-only key must allow execute permission.
Another ABI change.
Are we calling this a
On 06/19/2018 04:47 PM, Michael Ellerman wrote:
"Aneesh Kumar K.V" writes:
With 4k page size for hugetlb we allocate hugepage directories from its on slab
cache. With patch 0c4d26802 ("powerpc/book3s64/mm: Simplify the rcu callback for
page table free")
we missed to free these allocated hugep
On Sat, Jun 16, 2018 at 4:04 AM Jiri Slaby wrote:
>
> On 11/21/2017, 08:24 AM, Michal Hocko wrote:
> > On Thu 16-11-17 20:46:01, Pavel Tatashin wrote:
> >> There is no need to have ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT,
> >> as all the page initialization code is in common code.
> >>
> >> Also,
The real-time clock on m68k (and powerpc) mac systems uses an unsigned
32-bit value starting in 1904, which overflows in 2040, about two years
later than everyone else, but this gets wrapped around in the Linux
code in 2038 already because of the deprecated usage of time_t and/or
long in the conver
As Mathieu pointed out, my conversion to time64_t was incorrect and resulted
in negative times to be read from the RTC. The problem is that during the
conversion from a byte array to a time64_t, the 'unsigned char' variable
holding the top byte gets turned into a negative signed 32-bit integer
befo
Commit 397ac99c6cef ("m68k: remove dead timer code") removed set_rtc_mmss()
because it was unused in 2012. However, this was itself the only user of the
mach_set_clock_mmss() callback and the many implementations of that callback,
which are equally unused.
This removes all of those as well.
Acked
On Tue, Jun 19, 2018 at 10:39:52PM +1000, Michael Ellerman wrote:
> Ram Pai writes:
>
> > In a multithreaded application, a key allocated by one thread must
> > be activate and usable on all threads.
> >
> > Currently this is not the case, because the UAMOR bits for all keys are
> > disabled by d
On Tue, Jun 19, 2018 at 10:39:56PM +1000, Michael Ellerman wrote:
> Ram Pai writes:
>
> > When a thread forks the contents of AMR, IAMR, UAMOR registers in the
> > newly forked thread are not inherited.
> >
> > Save the registers before forking, for content of those
> > registers to be automatica
On 6/19/18 1:29 AM, Michael Ellerman wrote:
> Jens Axboe writes:
>> On 6/18/18 1:33 AM, Michael Ellerman wrote:
>>> Tejun Heo writes:
>>> ...
Jens Axboe (10):
libata: introduce notion of separate hardware tags
libata: convert core and drivers to ->hw_tag usage
On Mon, Jun 18, 2018 at 1:57 PM, Daniel Walker wrote:
> Cisco has a couple platforms which depend on the domain values getting
> set a certain way. We discovered our machines not detecting the pci
> devices, and traced it back to this commit,
>
> 63a7228 powerpc/pci: Assign fixed PHB number based
On 6/19/18 1:29 AM, Michael Ellerman wrote:
> Jens Axboe writes:
>> On 6/18/18 1:33 AM, Michael Ellerman wrote:
>>> Tejun Heo writes:
>>> ...
Jens Axboe (10):
libata: introduce notion of separate hardware tags
libata: convert core and drivers to ->hw_tag usage
Remove arch dependent setjump/longjump functions
and unused fields in kprobe_ctlblk for jprobes
from arch/powerpc. This also reverts commits
related __is_active_jprobe() function.
Signed-off-by: Masami Hiramatsu
Acked-by: "Naveen N. Rao"
Cc: Benjamin Herrenschmidt
Cc: Paul Mackerras
Cc: Michae
Don't call the ->break_handler() from the powerpc kprobes code,
because it was only used by jprobes which got removed.
This also removes skip_singlestep() and embeds it in the
caller, kprobe_ftrace_handler(), which simplifies regs->nip
operation around there.
Signed-off-by: Masami Hiramatsu
Acke
Clear current_kprobe and enable preemption in kprobe
even if pre_handler returns !0.
This simplifies function override using kprobes.
Jprobe used to require to keep the preemption disabled and
keep current_kprobe until it returned to original function
entry. For this reason kprobe_int3_handler()
Joakim,
I am not the maintainer for this driver. Adding Mark Brown.
York
On 06/19/2018 09:23 AM, Joakim Tjernlund wrote:
> espi does not look for a OF cell-index property which
> makes the bus numbering dynamic only. This add an
> optional cell-index.
>
> Signed-off-by: Joakim Tjernlund
> ---
This cousin to gpio-mpc8xxx was lacking a multiple pins method,
add one.
Signed-off-by: Joakim Tjernlund
---
drivers/soc/fsl/qe/gpio.c | 28
1 file changed, 28 insertions(+)
diff --git a/drivers/soc/fsl/qe/gpio.c b/drivers/soc/fsl/qe/gpio.c
index 3b27075c21a7..819be
espi does not look for a OF cell-index property which
makes the bus numbering dynamic only. This add an
optional cell-index.
Signed-off-by: Joakim Tjernlund
---
drivers/spi/spi-fsl-espi.c | 8
1 file changed, 8 insertions(+)
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl
On Tue, Jun 19, 2018 at 10:39:59PM +1000, Michael Ellerman wrote:
> Ram Pai writes:
> > Deny all permissions on all keys, with some exceptions. pkey-0 must
> > allow all permissions, or else everything comes to a screaching halt.
> > Execute-only key must allow execute permission.
>
> Another AB
On Tue, Jun 19, 2018 at 10:40:08PM +1000, Michael Ellerman wrote:
> Ram Pai writes:
> > Applications need the ability to associate an address-range with some
> > key and latter revert to its initial default key. Pkey-0 comes close to
> > providing this function but falls short, because the current
On 06/19/2018 09:22 AM, Joakim Tjernlund wrote:
> This cousin to gpio-mpc8xxx was lacking a multiple pins method,
> add one.
>
> Signed-off-by: Joakim Tjernlund
> ---
> drivers/soc/fsl/qe/gpio.c | 28
> 1 file changed, 28 insertions(+)
>
Joakim,
I am not the maint
On Tue, Jun 19, 2018 at 10:40:13PM +1000, Michael Ellerman wrote:
> Ram Pai writes:
>
> > execute-only key is allocated dynamically. This is a problem. When a
> > thread implicitly creates a execute-only key, and resets UAMOR for that
> > key, the UAMOR value does not percolate to all the other
On 06/19/2018 09:26 AM, Guilherme G. Piccoli wrote:
[...]
What your doing is changing the phb_id to some transformation of "reg" for
all platforms except which have "ibm,opal-phbid". This is what we observe.
This is a radical altering of the prior phb_id selection before your patch.
The question
On Tue, 2018-06-19 at 16:38 +, York Sun wrote:
> On 06/19/2018 09:22 AM, Joakim Tjernlund wrote:
> > This cousin to gpio-mpc8xxx was lacking a multiple pins method,
> > add one.
> >
> > Signed-off-by: Joakim Tjernlund
> > ---
> > drivers/soc/fsl/qe/gpio.c | 28
>
Hi.
2018-06-16 9:53 GMT+09:00 Paul Burton :
> From: Arnd Bergmann
>
> I have occasionally run into a situation where it would make sense to
> control a compiler warning from a source file rather than doing so from
> a Makefile using the $(cc-disable-warning, ...) or $(cc-option, ...)
> helpers.
>
Hi Masahiro,
On Wed, Jun 20, 2018 at 02:34:35AM +0900, Masahiro Yamada wrote:
> 2018-06-16 9:53 GMT+09:00 Paul Burton :
> > diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
> > index f1a7492a5cc8..aba64a2912d8 100644
> > --- a/include/linux/compiler-gcc.h
> > +++ b/include/
On Jun 18 2018, Eric Dumazet wrote:
> DUMP_PREFIX_ADDRESS might give us more information (say alignment problem, or
> crossing page boundaries)
DUMP_PREFIX_ADDRESS is useless for that purpose.
Here are some samples of broken csums:
[ 853.849225] sungem: sungem wrong csum : 9886/07be, len 94
This patch updates the get/set regset functions that flush tm, fpu and
altvec state when TM is available and active to use a helper function.
Signed-off-by: Pedro Franco de Carvalho
---
arch/powerpc/kernel/ptrace.c | 104 ---
1 file changed, 28 insertions(
Would something like this be ok?
I factored out the calls to flush_fp_to_thread and flush_altivec_to_thread,
although I don't really understand why these are necessary. The tm_cvsx_get/set
functions also calls flush_vsx_to_thread (outside of the helper function).
I also noticed that tm_ppr/dscr/t
On Tue, Jun 19, 2018 at 9:50 AM Pavel Tatashin
wrote:
>
> On Sat, Jun 16, 2018 at 4:04 AM Jiri Slaby wrote:
> >
> > On 11/21/2017, 08:24 AM, Michal Hocko wrote:
> > > On Thu 16-11-17 20:46:01, Pavel Tatashin wrote:
> > >> There is no need to have ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT,
> > >> as
On 06/19/2018 12:10 PM, Andreas Schwab wrote:
> On Jun 18 2018, Eric Dumazet wrote:
>
>> DUMP_PREFIX_ADDRESS might give us more information (say alignment problem,
>> or crossing page boundaries)
>
> DUMP_PREFIX_ADDRESS is useless for that purpose.
>
> Here are some samples of broken csums:
This series introduces infrastructure allowing compiler diagnostics to
be disabled or their severity modified for specific pieces of code, with
suitable abstractions to prevent that code from becoming tied to a
specific compiler.
This infrastructure is then used to disable the -Wattribute-alias
wa
From: Arnd Bergmann
I have occasionally run into a situation where it would make sense to
control a compiler warning from a source file rather than doing so from
a Makefile using the $(cc-disable-warning, ...) or $(cc-option, ...)
helpers.
The approach here is similar to what glibc uses, using _
From: Arnd Bergmann
gcc-8 warns for every single definition of a system call entry
point, e.g.:
include/linux/compat.h:56:18: error: 'compat_sys_rt_sigprocmask' alias between
functions of incompatible types 'long int(int, compat_sigset_t *,
compat_sigset_t *, compat_size_t)' {aka 'long int(in
With SYSCALL_DEFINEx() disabling -Wattribute-alias generically, there's
no need to duplicate that for PowerPC syscalls.
This reverts commit 415520373975 ("powerpc: fix build failure by
disabling attribute-alias warning in pci_32") and commit 2479bfc9bc60
("powerpc: Fix build by disabling attribute
On Mon, 2010-08-09 at 14:11 +1000, Benjamin Herrenschmidt wrote:
> Hi Linus !
>
> Here's a few misc things for .36. The big bit is that I trimmed all the
> defconfigs using make savedefconfig.
>
> Then there's a revert for a change to the appletouch driver that went
> in .34 but broke quite a few
Hi Linus !
Here's a few misc things for .36. The big bit is that I trimmed all the
defconfigs using make savedefconfig.
Then there's a revert for a change to the appletouch driver that went
in .34 but broke quite a few powerbooks around. Since the original
problem this was trying to address is fa
On Sun, Aug 8, 2010 at 10:11 PM, Benjamin Herrenschmidt
wrote:
> Hi Linus !
>
> Here's a few misc things for .36. The big bit is that I trimmed all the
> defconfigs using make savedefconfig.
[...]
> 108 files changed, 270 insertions(+), 134609 deletions(-)
And how is anyone else to make it into
Enable kernel XZ compression option on BOOK3S_32. Tested on G4 PowerBook.
Signed-off-by: Aaro Koskinen
---
arch/powerpc/platforms/Kconfig.cputype | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/platforms/Kconfig.cputype
b/arch/powerpc/platforms/Kconfig.cputype
index 67d3125d061
Hi Arnd,
On 19/06/18 00:05, Arnd Bergmann wrote:
Commit 397ac99c6cef ("m68k: remove dead timer code") removed set_rtc_mmss()
because it was unused in 2012. However, this was itself the only user of the
mach_set_clock_mmss() callback and the many implementations of that callback,
which are equall
> [...]
> What your doing is changing the phb_id to some transformation of "reg" for
> all platforms except which have "ibm,opal-phbid". This is what we observe.
> This is a radical altering of the prior phb_id selection before your patch.
>
> The question is, was that your intent ? We are expectin
On 06/19/2018 01:10 PM, Eric Dumazet wrote:
>
>
> On 06/19/2018 12:10 PM, Andreas Schwab wrote:
>> On Jun 18 2018, Eric Dumazet wrote:
>>
>>> DUMP_PREFIX_ADDRESS might give us more information (say alignment problem,
>>> or crossing page boundaries)
>>
>> DUMP_PREFIX_ADDRESS is useless for t
On Jun 19 2018, Eric Dumazet wrote:
> diff --git a/drivers/net/ethernet/sun/sungem.c
> b/drivers/net/ethernet/sun/sungem.c
> index
> 7a16d40a72d13cf1d522e8a3a396c826fe76f9b9..672d6748ab44f0890e92d5ca55d6ff6834c20dc9
> 100644
> --- a/drivers/net/ethernet/sun/sungem.c
> +++ b/drivers/net/etherne
On 06/19/2018 03:32 PM, Andreas Schwab wrote:
> On Jun 19 2018, Eric Dumazet wrote:
>
>> diff --git a/drivers/net/ethernet/sun/sungem.c
>> b/drivers/net/ethernet/sun/sungem.c
>> index
>> 7a16d40a72d13cf1d522e8a3a396c826fe76f9b9..672d6748ab44f0890e92d5ca55d6ff6834c20dc9
>> 100644
>> --- a/dr
On Wed, Jun 20, 2018 at 5:23 AM Benjamin Herrenschmidt
wrote:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc.git merge
I love the alleged line removal, but there's nothing in that 'merge'
branch. It points to an ancient powerpc commit from 2016.
And please, signed tags. I know
I broke the build when CONFIG_NMI_IPI=n with my recent commit to add
arch_trigger_cpumask_backtrace(), eg:
stacktrace.c:(.text+0x1b0): undefined reference to `.smp_send_safe_nmi_ipi'
We should rework the CONFIG symbols here in future to avoid these
double barrelled ifdefs but for now they fix t
On Sat, 2018-05-19 at 04:35:52 UTC, Nicholas Piggin wrote:
> Similarly to commit 855bfe0de1 ("powerpc: hard disable irqs in
> smp_send_stop loop"), irqs should be hard disabled by
> panic_smp_self_stop.
>
> Signed-off-by: Nicholas Piggin
Series applied to powerpc fixes, thanks.
https://git.kern
On Wed, 2018-06-13 at 13:23:56 UTC, Michael Ellerman wrote:
> In the device tree CPU features quirk code we want to set
> CPU_FTR_POWER9_DD2_1 on all Power9s that aren't DD2.0 or earlier. But
> we got the logic wrong and instead set it on all CPUs that aren't
> Power9 DD2.0 or earlier, ie. includin
On Thu, 2018-06-14 at 15:27:42 UTC, Michael Jeanson wrote:
> In binutils 2.26 a new opcode for the "wait" instruction was added for the
> POWER9 and has precedence over the one specific to the e500mc. Commit
> ebf714ff3756 ("powerpc/e500mc: Add support for the wait instruction in
> e500_idle") uses
On Fri, 2018-06-15 at 01:38:37 UTC, Nicholas Piggin wrote:
> The patch 99baac21e4 ("mm: fix MADV_[FREE|DONTNEED] TLB flush miss
> problem") added a force flush mode to the mmu_gather flush, which
> unconditionally flushes the entire address range being invalidated
> (even if actual ptes only covere
Jens Axboe writes:
> On 6/19/18 1:29 AM, Michael Ellerman wrote:
>> Jens Axboe writes:
>>> On 6/18/18 1:33 AM, Michael Ellerman wrote:
Tejun Heo writes:
...
> Jens Axboe (10):
> libata: introduce notion of separate hardware tags
> libata: convert core and driver
On 6/19/18 5:35 PM, Michael Ellerman wrote:
> Jens Axboe writes:
>> On 6/19/18 1:29 AM, Michael Ellerman wrote:
>>> Jens Axboe writes:
On 6/18/18 1:33 AM, Michael Ellerman wrote:
> Tejun Heo writes:
> ...
>> Jens Axboe (10):
>> libata: introduce notion of separate hard
On Wed, 2018-06-20 at 07:58 +0900, Linus Torvalds wrote:
> On Wed, Jun 20, 2018 at 5:23 AM Benjamin Herrenschmidt
> wrote:
> >
> > git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc.git merge
>
> I love the alleged line removal, but there's nothing in that 'merge'
> branch. It points t
On Sat, Jun 16, 2018 at 03:24:49PM +0200, Thomas Gleixner wrote:
> On Fri, 15 Jun 2018, Ricardo Neri wrote:
> > On Fri, Jun 15, 2018 at 11:19:09AM +0200, Thomas Gleixner wrote:
> > > On Thu, 14 Jun 2018, Ricardo Neri wrote:
> > > > Alternatively, there could be a counter that skips reading the HPET
On 06/19/2018 05:15 PM, Ricardo Neri wrote:
> On Sat, Jun 16, 2018 at 03:24:49PM +0200, Thomas Gleixner wrote:
>> On Fri, 15 Jun 2018, Ricardo Neri wrote:
>>> On Fri, Jun 15, 2018 at 11:19:09AM +0200, Thomas Gleixner wrote:
On Thu, 14 Jun 2018, Ricardo Neri wrote:
> Alternatively, there co
On Tue, Jun 19, 2018 at 06:44:13PM +1000, Alexey Kardashevskiy wrote:
> The size is always equal to 1 page so let's use this. Later on this will
> be used for other checks which use page shifts to check the granularity
> of access.
>
> This should cause no behavioral change.
>
> Signed-off-by: Al
On Mon, 2018-06-18 at 14:14 +0200, Frederic Barrat wrote:
> If a process exits without doing proper cleanup, there's a window
> where an opencapi device can try to access the memory of the dying
> process and may trigger a page fault. That's an expected scenario and
> the ocxl driver holds a refere
Kernel pagetable pages for PTE fragments never go through the standard init
sequence which can cause inaccuracies in utilization statistics reported at
places like /proc and /sysfs interfaces etc. Also the allocated page misses
out on pagetable lock and page flag init as well. Fix it by making sure
Hi Akshay,
On Tue, Jun 19, 2018 at 10:34:26AM +0530, Akshay Adiga wrote:
> Device-tree parsing happens in twice, once while deciding idle state to
> be used for hotplug and once during cpuidle init. Hence, parsing the
> device tree and caching it will reduce code duplication. Parsing code
> has be
Hi Akshay,
On Tue, Jun 19, 2018 at 10:34:27AM +0530, Akshay Adiga wrote:
> The required data is accessible from cpuidle_states structure and
> nr_cpu_idle_states. This patch makes changes to avoid reparsing and use
> data from these structures.
>
> Signed-off-by: Akshay Adiga
> ---
> arch/powe
Hi Akshay,
On Tue, Jun 19, 2018 at 10:34:28AM +0530, Akshay Adiga wrote:
> Export pnv_idle_states and nr_pnv_idle_states so that its accessible to
> cpuidle driver. Use properties from pnv_idle_states structure for powernv
> cpuidle_init.
>
> Signed-off-by: Akshay Adiga
> ---
> arch/powerpc/inc
Key 2 is preallocated and reserved for execute-only key. In rare
cases if key-2 is unavailable, mprotect(PROT_EXEC) will behave
incorrectly. NOTE: mprotect(PROT_EXEC) uses execute-only key.
Ensure key 2 is available for preallocation before reserving it for
execute_only purpose.
CC: Michael Eller
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